diff --git a/test-requirements.txt b/test-requirements.txt
index 3182472..d30c13f 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -5,5 +5,5 @@
 hacking<0.11,>=0.10.2 # Apache-2.0
 
 Babel!=2.4.0,>=2.3.4 # BSD
-sphinx>=1.5.1 # BSD
+sphinx!=1.6.1,>=1.5.1 # BSD
 oslosphinx>=4.7.0 # Apache-2.0